Cam for looms



H. A. DAVIS CAM FOR LOOMS.

APPLICATION FILED FEB. 14, 1919.

. 1 350,094 Patented Aug 157, 192%,

UNITED STATES PATENT OFFICE.

HARRY A. DAVIS, OF HOPEDALE, MASSACHUSETTS, ASSTGNOR TO DR'APER CORPORA- TION, OF HOPEDALE, MASSACHUSETTS, A CORPORATION OF MAINE.

CAM FOR LOOMS.

Specification of Letters Patent. Patented Aug, 17, 1920,

Application filed February 14, 1919. Serial No. 277,068.

To all whom it may concern:

Be it known that I, HARRY A. DAVIS, a citizen, of the United States, residing at Hopedale, county of WVorcester and State of Massachusetts, have invented an Improvement in'Cams for Looms, of which the following description, in connection with the accompanying drawings, is a specification, like characters on the drawings representing like parts. i The invention to be hereinafter described relates to cams for looms and other purposes.

These cams experience hard usage and become worn so that from time to time it is necessary to remove the cams from their shafts to facilitate repair thereof and to substitute new cams for old ones. 7 The purpose of the present invention is to provide a cam which may be inserted on or removed from its shaft quickly, easily and without disturbingthe shaft or dismantling the machine.

The character of the invention will be best understood by reference to the following description of one good form thereof shown in the accompanying drawing,

Figure 1 is a perspective view of a cam for a picking motion of a loom and a portion of the shafton which the cam is mounted Fig. 2 on all-enlarged scale is a perspective view of a portion'of the cam and the bridge member for the passage leading to the shaft receiving opening;

Fig. 3 is a perspective view of the side of the bridge member reverse to that shown in Fig. 2; and

Fig. 4 is'a sectional detail to be referred to.

Referring tothe drawing, the cam selected herein to illustrate the invention is of the type used in a picking motion for looms, and comprises a peripheral portion, in the present instance, in the form of a flange 1 adapted to engage and actuate the follower. This flange is connected by a web 3 with a hub 5 having an inner diam'e eter somewhat larger than the diameter of the shaft 7 on which the cam is mounted.

The point 9 of the cam is the part which experiences the hardest usage, and therefore, this point may be formed on a section 11 detachably secured by a bolt13 to the web 3 in a manner well understood in the art, and therefore, further illustration and description of this feature are unnecessary.

It is desirable that the cam may be readily applied to or removed from its shaft without disturbing the shaft, the bearings therefor, or other parts which may be mounted on or cooperate with said shaft. To accomplish this, in the present instance of the invention, the cam is provided with a radial passage 15 extending through the peripheral flange l, the web 3 and the hub 5 of the cam, and communicating with the shaft receiving opening in the hub. The width of the passage 15 preferably is slightly greater than the diameter of the shaft, in order that the latter may be readily admitted to theopening in the hub, but is substantially less than the internal diameter of the hub.

To connect the cam to the shaft, a bushing 17 may be keyed to said shaft, and may be provided with wings l9 projecting diamct rically from the bushing and adapted to have overlapping relation with the web 3 These wings may be secured to said ,web by bolts 21 entered through elongated slots 23 in the web, the construction being such that the cam may be susceptible of a certain amount of rotative adjustment properly to position the same on the shaft.

'lVhen it is desired to apply the cam to the shaft, the cam is presented to the shaft, and the passage 15 is inserted over the shaft,

thereby admitting the latter to the opening in the hub. Then the cam is adjusted along the shaft in the direction of the axis thereof to slide the hub of the cam onto the bushing 17 until limited by engagement of the wings 19 with the web of the cam. Then the bolts 21 may be inserted and tightened securely to connect the cam with said wings. Since the external diameter of the bushing is greater than the width of the shaft admission passage re, the cam will be properly maintained on the shaft with no possibility of may be more or less irregular.

of working loose therefrom or escape ofthe cam from the shaft through the passage 15.

The interruption of the peripheral flange 1 by the shaft admission passage 15, necessitates the provision of a member to bridge said passage and form a continuation of said flange. In the present instance, for this purpose a bridge member 25 is provided comprising a plate 27 and a flange section 29* of a length equal to the width of the passage 15, and of a form corresponding to the form of the flange of the cam.

It is important that the flange section 29 shall be maintained in accurate registration with the flange 1 of the cam to insure proper operation of the cam. To accomplish this,the plate 27 is provided with wings 29 adapted to seat in recesses 31 formed in one face of the web 3 of the cam at opposite sides of the shaft admission passage 15. The cam and the bridging member preferably are made of cast metal, and therefore, the surfaces there- To insure proper positioning of the plate 27 in said recesses, the plate may have nubs 33 formed thereon and provided with finished ends for engagement with the bottom of the recesses 31 at distributed points, and the edge of the plate 27 may have finished facets 35 for en gagement with sides of the recesses to provide desirable contact therewith and prevent movement of the plate 27 in all directions in the plane of said plate.

Suitable means may be provided detachably to connect the plate 27 with the web of the. cam. To accomplish this, in the present instance, .a pair of'bolts 37 are provided having square shanks 39 and adapted to enter registering holes ll and m'the web and plate respectively. These bolts may be provided with spring lock washers L3 confined against the nuts of the bolts and washers 47 bearing against the outer. face of the plate 27.

It will be noted that the bolt holes &3 are located substantially centrally with respect to two groups of nubs 38, so that the bolts will desirably distribute the pressure of said nubs againstthe bottoms of the recesses 31. The inner edge of the plate 27' may have a curved portion 4L9 which preferably will be spaced somewhat from the bushing 17 when the bridging member is connected to the cam, thereby to relieve the bridging memberfrom the duty of contributing to the retention of the bushing or the shaft in the hub.

moval of the cam therefrom as desired,

without disturbingthe shaft or other parts wlnchma-y bemounted thereon. When the bridging member 15 applied to the cam, it

will be securely maintained in position to insure proper register of the flange section 29* with the flange 1 of the cam.

It will be understood that the invention is not limited to the specific embodiment shown, and that various deviations may be made therefrom without departing from the spirit and scope of the appendedclaims.

"hat is claimed is lvA'picker cam comprising a hub portion, a circumferential flange portion and a web portion extending between said hub and flange portions; said cam having a radial passage of less width than the diameter of the hub and extending outward I from the interior of said hub, said web' having plate receiving sockets formed in a face thereof upon each side of said passage, a bridge plate adapted to span the radial passage in the cam and provided withwing portions snugly fitting said sockets, said sockets constructed'to entirely surround the edges of said wing portions to retain the bridge plate against lateral displacement in any direction, and means for securing said wing portions within said sockets.

2. A picker cam comprising a hub portion, a circumferential flange portion and a web portion extending between said hub and flange portions; said cam having a radial passage extending outward from the in terior of said hub, said web having plate receiving sockets formed in a face thereof upon each side of the passage, a bridge plate adapted to span said passage and provided with wings received in the sockets, said sockets constructed to surround the edges of the wings and to snugly engage the same to hold the bridge plate against lateral displacement, and meansfor securing said wings withinthe sockets.

3. A picker cam comprising a hub portion, a-circumferential flange portion and a web portion extending between said hub and flange portions; "said cam having aradial passage of less width than the diameter of the hub and extending outward from the interior of said hub, said web having plate receiving sockets formed in a face thereof upon each; side ofsaid passage, a bridge plate adapted to span the'radial passage in the cam and provided with wing portions extending into said sockets, said wings having bearing nu'bsupon the inner face thereof to firmly seat within said sockets, and means for securing said wings within said sockets. v

.4. A cam comprising a hub, a peripheral flange and a web connecting said hub and flange, said camjhaving a radial passage of less width than the diameter of the hub, a bridge plate having alaterally extended flange section and side wings adapted to fltagainst. the web of the .cam inside the flange thereof, and bolts passing through the .wings and web of the cam at opposite sides of the radial passage for securing the bridge plate in place.

5. A cam provided with a hub, a peripl1- eral flange and a web connecting said hub and flange, said cam having a radial passage of less width than the diameter of the hub and provided with countersunk plate having a laterally extending flange 10 section and side wings fitting the countersunk sockets inside the peripheral flange, and bolts for securing the bridge plate in the sockets of the cam web.

In testimony whereof I have signed my 15 name to this specification.

v HARRY A. DAVIS. 

